Master locks are at the top of the ranking of treasure padlocks, and the strength is needless to say. Master locks were established in 1921, the first steel mille-feuille lock was patented in 1924, and during World War I, a special padlock for tank protection was invented, and the company's founders served as security advisers to the troops in both world wars. In 1970, Master Lock joined the Fortune 500 Fujun Group in the United States, which is the world's largest manufacturer of portable security products and is also recognized as the leader in security padlocks.
 
The U-shaped lock represented by 8238DPRO occupies the highest security level in the Sold Secure and ART test reports, and the lock body is made of high-quality alloy steel, which controls the weight in a lighter range while ensuring safety. The high-precision marbles, keys and locks produced by professional equipment minimize the mutual opening rate, and the production of special key embryos is strictly controlled, eliminating the phenomenon of illegal local copying of keys.
 
Master Lock has a branch in China, and there is also a flagship store online, and the warranty service is represented by JD.com. However, in addition to the purchase of the three keys that come with it, it will be relatively difficult to apply for additional key delivery, and theoretically after purchasing the key, you must register according to the key code to enjoy the free key preparation service, but the official website of Master China does not provide a registration channel. Master JD flagship store recommends that users should keep the key properly after purchasing the lock, otherwise the lock will be scrapped. Considering the company's U-lock security rating, it can be embarrassing to find that the last key is missing while the lock is closed. The Master 8238DPRO is only priced at 149 yuan, and if you don't mind being too large (so much so that it is sometimes used as a glass door lock) and the budget is relatively tight, then this U-shaped lock will be a very good choice.